Panchromoendoscopy using Oral Indigo Carmine Mixed with Polyethylene Glycol Prep

  • Study type:

    Interventional What is this?

    Describes the nature of a clinical study. Types include:

    • Observational study — observes people and measures outcomes without affecting results.
    • Interventional study (clinical trial) — studies new tests, treatments, drugs, surgical procedures or devices.
    • Medical records research — uses historical information collected from medical records of large groups of people to study how diseases progress and which treatments and surgeries work best.
  • Study phase:

    I/II What is this?

    During the early phases (phases 1 and 2), researchers assess safety, side effects, optimal dosages and risks/benefits. In the later phase (phase 3), researchers study whether the treatment works better than the current standard therapy. They also compare the safety of the new treatment with that of current treatments. Phase 3 trials include large numbers of people to make sure that the result is valid. There are also less common very early (phase 0) and later (phase 4) phases. Phase 0 trials are small trials that help researchers decide if a new agent should be tested in a phase 1 trial. Phase 4 trials look at long-term safety and effectiveness, after a new treatment has been approved and is on the market.

Study IDs

  • Site IRB:

    • Scottsdale/Phoenix, Arizona: 12-009897
  • NCT ID:

  • Sponsor Protocol Number:


About this study

This study first is designed to see what dose of indigo carmine ingested orally mixed with the standard colonoscopy prep is needed to provide adequate staining of the right colon. It then will use this adequate staining concentration of Indigo Carmine to study whether this dye will increase the detection of polyps during colonoscopy.

Participation eligibility

Participant eligibility includes age, gender, type and stage of disease, and previous treatments or health concerns. Guidelines differ from study to study, and identify who can or cannot participate. If you need assistance understanding the eligibility criteria, please contact the study team.

See eligibility criteria

Inclusion criteria:

  • Patients presenting for screening or surveillance colonoscopy
  • Must be aged 50 to 65 yrs
  • Must be able and willing to sign informed consent

Exclusion criteria:

  • Known Creatinine >1.2
  • Cirrhosis
  • Pregnancy or breast feeding
  • History of anaphylaxis to any dye
  • History of bowel surgery or small bowel obstruction
  • History of aspiration
  • History of dysphagia
  • American Society of Anesthesia class >2
  • History of abnormal liver function test in the last year
  • History of any degree of cytopenia in the last year

Participating Mayo Clinic locations

Study statuses change often. Please contact us for help.

Mayo Clinic Location Status

Scottsdale/Phoenix, Ariz.

Mayo Clinic principal investigator

M Harrison, M.D.

Closed for enrollment